I just tried to  update VS2017 CE from the Tools-> Extensions and Updates dialog, and the operation failed with the message:

7/11/2017 7:16:34 AM - Version value mismatch. VsixManifest value: '1706.25.4'; Catalog manifest value: '1706.25.3'; Package manifest value: '1706.25.3'
7/11/2017 7:16:34 AM - Install Error : System.InvalidOperationException: The value of property 'Version' is not consistent amongst all manifests.

I have attached the install log.  If it helps, I had two VS2017 CE instances open when I started the update, but the install didn't actually start until I closed both.

Any ideas?

Frank

PS:  I had to change the extension on the install log from .LOG to .TXT - how come you don't allow install logs to be posted with the originan extension - seems a bit counter-productive, don't ya think? .